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C Program to Convert Binary to Octal



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In this tutorial, we will learn about how to create a program in C that can convert any given binary number (by user at run-time) into its equivalent octal number. At last we have also created a function named BinToOct() that does the same job.

But before going through the program, if you are not aware of

then refer to Binary to Octal conversion step by step process. Now let's move on to the program.

Binary to Octal in C

The question is, Write a program in C that converts any given binary number into its equivalent octal value. The answer to this question is:

#include<stdio.h>
#include<conio.h>
int main()
{
    int bin, oct=0, i=0, mul=1, count=1, rem, octnum[20];
    printf("Enter any Binary Number: ");
    scanf("%d", &bin);
    while(bin!=0)
    {
        rem = bin%10;
        oct = oct + (rem*mul);
        if(count%3==0)
        {
            octnum[i] = oct;
            mul = 1;
            oct = 0;
            count = 1;
            i++;
        }
        else
        {
            mul = mul*2;
            count++;
        }
        bin = bin/10;
    }
    if(count!=1)
        octnum[i] = oct;
    printf("\nEquivalent Octal Value = ");
    for(i=i; i>=0; i--)
        printf("%d", octnum[i]);
    getch();
    return 0;
}

As the above program was written under Code::Blocks IDE, therefore after successful build and run, here is the first snapshot of the sample run:

c binary to octal conversion

Now supply any binary number say 1101110 as input and press ENTER key to see its equivalent octal value as shown in the second snapshot of the sample run given below:

binary to octal conversion in c

Here is the final snapshot of another sample run:

c program convert binary to octal

Program Explained

Binary to Octal in C using User-defined Function

The question is, Write a program in C that converts Binary to Octal using user-defined function named BinToOct(). Here we have declared the variable i and the array octnum[20] as global variable (out from both the function) to make it known inside both the function that is main() and BinToOct() function.

#include<stdio.h>
#include<conio.h>
void BinToOct(int bin);
int i=0;
int octnum[20];
int main()
{
    int binnum;
    printf("Enter any Binary Number: ");
    scanf("%d", &binnum);
    BinToOct(binnum);
    printf("\nEquivalent Octal Value = ");
    for(i=i; i>=0; i--)
        printf("%d", octnum[i]);
    getch();
    return 0;
}
void BinToOct(int bin)
{
    int oct=0, mul=1, count=1, rem;
    while(bin!=0)
    {
        rem = bin%10;
        oct = oct + (rem*mul);
        if(count%3==0)
        {
            octnum[i] = oct;
            mul = 1;
            oct = 0;
            count = 1;
            i++;
        }
        else
        {
            mul = mul*2;
            count++;
        }
        bin = bin/10;
    }
    if(count!=1)
        octnum[i] = oct;
}

Here is the final snapshot of above program's sample run:

c binary to octal using function

Same Program in Other Languages

C Online Test


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